Wire guide for papermaking machines



Jan. 10, 1950 K. A. KARLSSON WIRE GUIDE FOR PAPER MAKING MACHINES 2Sheets-Sheet 1 Filed April 8, 1946 1950 I K. A.VKARLSSON 4,

WIRE GUIDE FOR PAPER MAKING MACHINES Filed April 8, 1946 I Shets-Sheet 2Patented Jan. 10, 1950 WIRE GUIDE FOR PAPERMAKING MACHINES Karl-ArvidKarlsson, Skapafors, Sweden Application April 8, 194.6, Serial No.660,357

In Sweden April 13, 1 945 v It is a well known fact that wire-cloths,press felts, drying felts and similar webs are used in connection withpaper making machines have a tendency during their usually comparativelylong uninterrupted running to displace themselves (or wander) laterallywith relation to the guide rolls carrying them. Said displacement, orWandering, however, must not proceed to such an extent that the web maybecome damaged or destroyed bystriking .the frame of the machine. .Inorder to avoid this risk the web had to be restored at intervals to itsnormal position. To this end it has already been proposed to make thebearing for oneend of the shaft of one of the guide rolls carrying thewire adjustable in the longitudinal direction of the web so that it maybe moved within certain .limits in the direction of movement of the webor in the opposite direction, as the case may be, for imparting to theweb an impulse of moving laterally in opposition to its sense ofwandering, until the web is restored to its normal position.

Such an adjustment of one end of the guide roll may be effected eithermanually or by mechanical means. The manual adjustment requires theoperators perpetual attention and, in certain cases, a special operatoris required whose only mission is to look to the web. The mechanicalguiding mechanisms hitherto practised are usually of a complicatedstructure and, therefore, expensive in manufacture and repair. Inaddition, a very strong power impulse had to be exerted by the web foroperating them. Thus, guiding mechanisms of this type cannot be used toadvantage, for instance, in connection with press felts and other websof a soft, porous structure.

The present invention has for its object to provide aguide mechanism,hereinafter referred to as wire guide, which does not suffer from thedrawbacks above referred to. Thus, it is simple in structure and can bemanufactured at moderate costs and, moreover, it requires but a weakimpulse of the wire for its operation and, as a result, it is fit foruse also in connection with webs of a soft nature. Compared with thewire guides provided with ratchet wheels and pawls, and which operateata constant speed, the wire guide forming the subject matter of theinvention presents the additional advantage of operating ata speed thatis, substantially, depending on the degree of lateral displacement ofthe wire.

According to a feature of the invention the power as required foreffecting the lateral adjustment of the bearing for one end of the shaftof 6 Claims. (01. 74441) I a guide roll for the Wire with a view tocorrecting the position of the wire is derived from the guide rollitself, while the Wire needs only deliver an impulse for controlling thedegree of said adjust? ment. 1

To this end separate means are provided to eifect said adjustment ofbearing by power derived from the guide roll itselfand other independentmeans are provided for regulating the degree of said adjustment underthe control of an impulse exerted by the wire. Since said two kinds ofmeans are mechanically independent of each other they may operateindependently of each other in direct dependency of the degree oflateral displacement of the wire synchronously therewith, .therebypreventin the occurrence of oscillations during the performance of theWire correcting operation.

.In. the accompanying drawings in which an embodiment of the inventionis illustrated, Fig. 1 is a section on line II in Fig. 2. Fig. 2 is asection on. line II-II in Fig. l, and Fig. 3 is a section on line IIIIIIin Fig. l.

. With .referenceto the drawing the numeral I designates the wire of apaper machine, not shown, 2 is. a guide roll therefor by means of whichcorrection of thelateral displacement of thewire is to be'effected, and3 is the shaft end of said roll facing the operator side of the machine.Said shaft end is rotatably mounted in a hearing A in turn slidablymounted in a stationarybedplate 5. To this end the bed plate is providedwith a longitudinal slot 6 engaged by a cylindrical block I on the underside of the bearing, so that the bearing may be adjusted in ahorizontaldirection parallel with the longitudinal direction of the wireI. In order to prevent the bearing from being accidentally lifted out ofengagement with the guideway, the cylindrical block I. carries at itslower end a plate 8 bearin against thelower surface of bed plate 5 atboth sides of the slot 6 therein.

Theshaft end of the guide roll 3 situated at the opposite side of themachine is mounted in a stationary bearing which should be rotatablyaround a vertical aXis, which may be represented, for instance, by ajournal similar to I mounted in. a cylindrical boring of. a stationarybed plate.

The shaft end 3 shown carries an eccentric or cam .9 surrounded alongits lower half periphery by a metallic arc IU of such a shape as to bereciprocated by the action of the eccentric or cam 9 in a horizontaldirection at right angles to the longitudinal direction of shaft end 3upon the rotation of the latter but is immovable in vertical direction.The metallic arc I is supported by two diametrically opposite bolts Hextending in the stated direction of movement of the metallic arc andare slidably mounted in borings formed in the side walls of the bearing4 beyond which walls they project to a certain extent. Upon the rotationof shaft end 3 said bolts will thus be moved to and fro.

Provided in front of the end of each bolt H is an axial cam in the shapeof an arced wedge l2 swinging around a shaft l3 common to both wedgeswhich is parallel with the bolts H. The centre of curvature of thewedges is on the axis of shaft 13 and the radius of curvature thereof isequal to the distance between the axis of shaft 13 and the axis of boltsll. As a result, the wedges are always situated in front of therespective bolts H. The two wedges are exactly equal but oppositelydirected. Their surfaces remote from the bolts are plane and form rightangles with the axis of the bolts. The means for supporting each wedgecomprises a strip or band, as for instance, a flat spring l4 connectingthe wedge to a supporting member [5 clamped to shaft I3. Shaft I3 isrotatably carried by pointed pivots i6, 50 as to form together with themembers l5, l4 and I2 an easily moving pendulum. Carried by a separatesupporting member [1 clamped to shaft I3 is a depending arm l8 whichcarries in turn an impulse member adapted to be engaged by one edge ofthe wire. Said impulse member may comprise a plate or the like, asindicated by dotted lines in Fig. 1. It is understood that a similarimpulse member is provided at the opposite edge of the wire where it maybe carried bya separate shaft similar to shaft 13 which constitutes, incombination with shaft l3 shown, the impulse member supporting arms, anda connecting rod between said arms, a link parallelogram. The entirependulum system is balanced by means of a counter-weight I9 which in theexampleshown is adjustably mounted on a bolt carried by the supportingmember I! which may be clamped in the position desired by means of ascrew. By means of this counter-weight the system may be exactlybalanced so that it obtains an indifierent equilibrium and can bestarted by a minimum of power.

The pointed pivots 16 supporting the shaft l3 comprise the conicallytapering ends of screws extending through threaded borings in heads 2|of columns 22 which are in turn fastened to frames 23 providedimmediately outside the plane vertical surfaces of the wedges 12, theframes being in their turn formed with plane vertical surfaces facingthose of the wedges. The space between adjacent vertical surfaces of thewedges and the frames is very small amounting to some tenths of amillimeter. For the sake of clearness, however, said space isover-dimensioned in the drawing.

The mechanism above described operates as follows:

Normally, that is, when the wire is in proper position with relation tothe guide roll shown, the springs M depend vertically keeping the wedgesl2 in a position in which they are just about to be engaged by thereciprocating bolts H. Assuming the wire starts displacing itselflaterally, as for instance, towards the operator side of the machine,then a swinging of the pendulum system towards the spectator in Fig. 1,downwardly in Fig. 2 and to the left in Fig. 3 takes place. This meansthat a Wider portion of the left hand wedge (Fig. 2) and a narrowerportion of the right hand wedge will enter the spaces between therespective bolts H and frames 23. Thus, the left hand bolt II willstrike the respective wedge forcing it against the frame and is thenprevented from moving further to the left under the action of theeccentric or cam 9. The continued action of the eccentric or cam on theleft hand side of the are ill will therefore cause a correspondingdisplacement of the cocentric 9 and shaft end 3 to the right. Thisdisplacement corresponds to the shortening of the stroke of the lefthand bolt by the movement of the respective wedge. Since the right handwedge has increased the space between it and the right hand bolt II byan amount exactly equal to the decrease of the stroke of the left handbolt as caused by the left hand wedge, the displacement of the eccentricand shaft end to the right just described will meet no obstacle.

By said adjustment of the shaft end the guide roll shown is set to anoblique position, thereby giving the wire a tendency to wander back toits normal position. According as this restoration proceeds the pendulumsystem is restored to normal.

Since the lateral displacement of the wire needs only cause an impulsefor controlling the degree of the adjustment of the guide rollerposition and said impulse needs only operate a balanced system, whilethe power for effecting the adjustment proper is derived from the guideroll itself, then the wire needs only yield a very weak impulse, whichcan never cause any damage of the edges of the wire.

What I claim is:

l. A wire guide for paper making machines comprising in combination, aroll over which the wire travels, a shaft for said roll, an adjustablebearing for one end of said shaft, a frame having a guideway for saidbearing extending in the longitudinal direction of the wire, and amechanism for shifting the position of said adjustable bearing in saidguideway to cause the roll to neutralize an undesired side movement ofthe Wire on the roll, said mechanism comprising elements carried by theadjustable bearing for reciprocating in th direction of its guidewaywithin a predetermined range of movement with relation to the bearing,means operable by the shaft of the guide roll to reciprocate saidelements as a unit within said range upon rotation of the shaft, meansmounted in said frame to move as a unit in paths traversing those ofsaid reciprocating elements in order to afford stop members therefor soas to thereby control the position of the range of movement of saidelements with respect to the frame, and means in said frame operable bythe wire in response to side movement thereof for shifting the positionof said stop members with a resulting shifting of the range of movementof the reciprocable elements of the bearing with relation to the frameand a consequent shifting of the position of the adjustable bearing inits guideway to allow the guide roll to neutralize the slide movement ofthe wire.

2. A wire guide for paper making machines comprising in combination, aroll over which the wire travels, a shaft for said roll, a bearingadjustable in the longitudinal direction of the wire for supporting oneend of said shaft, a frame having a guideway for said adjustable bearinand a mechanism for shifting the position of said adjustable bearing insaid guideway to allow the roll to neutralize an undesired side elementsas a unit within said range upon rotation of the shaft, wedge-shapedmembers mounted in said frame to-move as a unit in a directionperpendicular to that of said reciprocating bolts, said wedge-shapedmembers mounted in said frame to move as a unit in a directionperpendicular to that of said reciprocating bolts, said wedge-shapedmembers having parallel surfaces traversing the paths of the bolts underan oblique angle, so as to afford stop surfaces therefor, therebyshifting the range of movement of the bolts with relation to the frameupon a movement of the wedge-shaped members, and means in said frameoperable by the wire in response to side movements thereof forcorrespondingly shifting the position of said wedge-shaped members witha resulting shifting of the range of movement of the bolts with relationto the frame and a consequent shifting of the position of the adjustablebearing in its guideway.

3. A wire guide for paper making machines comprising in combination, aroll over which the wire travels, a shaft for said roll, a frame havinga guideway extending in the longitudinal direction of travel of thewire, a bearing adjustable in said guideway for supporting one end ofsaid shaft, and a mechanism for shifting the position of said adjustablebearing in said guideway to cause the roll to neutralize an undesiredside movement of the wire on the roll, said mechanism comprising twobolts slidably mounted in borings formed in the adjustable bearing onopposite sides of the shaft in a direction parallel to the guideway forthe bearing, each of said bolts projecting by both of its ends throughthe respective boring, an arc-shaped element connecting the inner endsof said bolts,

a cam on the shaft for operating said arc-shaped element to cause it toreciprocate the bols as a unit in their borings upon the rotation of theshaft with a range of movement with respect to 'the bearing whichdepends on the degree of eccentricity of said cam, a shaft rotatablymounted in the frame which extends in a direction at right angles tothat of the roll, a pair of curved wedges supported by said shaft totraverse the path of said bolts with their oblique faces forming equaloblique angles with relation thereto, and another member carried by saidshaft, to engage an edge of the wire in order to change the angularposition of the wedge supporting shaft in response to a side movement ofthe wire.

'4. A wire guide as claimed in claim 3, having the furthercharacteristic feature that the said curved wedges are bentconcentrically with respect to their supporting shaft.

5. A wire guide as claimed in claim 3, and in which the curved edges arebent concentrically with respect to their supporting shaft, having thefurther characteristic feature that said members are bounded at theiredges remote from the bolts, by plane surfaces lying in planes at rightangles to the supporting shaft, and at their edges facing the bolts byparallel spiral surfaces forming equal oblique angles with the path ofmovement of the bolts.

6. A wire guide as claimed in claim 3, in which means are provided tobalance said wedge supporting shaft and the elements supported therey.

KARL ARVID KARLSSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 994,910 Duesterhoff June 13, 19111,842,946 Prins Jan. 26, 1932 2,342,863 Hlavaty Feb. 29, 1944

